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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Phosphorus Dissolution by Microbial Activities: 2. Effect of Rock of Rock Phosphate Dissolution by Thiobacillus on Phosphorus Uptake and Growth of Corn.) ผู้เขียน: Soonthorn Maneesawas สื่อสิ่งพิมพ์:pdf AbstractThis experiment was aimed at evaluation of phosphorus availability resulted from rock phosphate dissolution by microbial activities. The experiment was initiated by improving some conditions of solution and soil, used as planting media, for optimal activities of Thiobacillus, a bacterium strain isolated from Ongkaruk soil. The corn seeds were planted in the solution and soil using rock phosphate, from Lumphun province, as a source of phosphorus fertilizer. The results indicated clearly that the inoculated Thiobacillus was able to dissolve phosphate from rock phosphate and available to plant, when this inoculated treatment was compared to that of uninoculated one highly significant difference was observed. Upon comparison of phosphorus uptake and dry weight of corn, it appeared that those observed in inoculated treatment were markedly higher than those observed in uninoculated one (addition with sterelized medium culture). It is hoped that these experimental results would support efficient uses of rock phosphate. |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Phosphorus Dissolution by Microbial Activities: 1.Dissolution of Rock Phosphate by Thiobacillus) ผู้เขียน:Soonthorn Maneesawas,  นายสมศักดิ์ วังใน, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractThe objective of this study was to evaluate the role of microbial activities on phosphorus dissolution. The 'tudy was performed by inoculating fresh and sterilized cells of Thiobacillus into flasks containing Thiobacillus medium with various amounts of rock phosphate. The flasks were incubated under shaking conditions at 28' C for 8 weeks. available phosphorus was analized weekly throughout the period of experiment. The experimental results showed that upon inoculation with fresh cells the available phosphorus concentration was markedly increased with incubation time, except those of treatments with sterilized cells. The marked increase in available phosphorus concentration was also observed with increasing rock phosphates, but the percentages of dissolution tended to decrease. Very slightly increase in soluble phosphorus was also observed with medium treated with sterilized cells, and approximately constant percentages of dissolution being observed. The dissolution of phosphate frdm rock phosphate appeared to qe significantly affected by activities or microorganism and quantities of rock phosphate added. It is suggested that rock phosphate could be dissolved through Thiobacillus activities and further studies leading to effectively practical used of rock phosphate are being warranted. |
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